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Agriculture
1,076
United States
980
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666
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559
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515
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506
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421
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413
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399
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377
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368
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356
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321
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314
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297
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291
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276
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269
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256
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240
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233
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232
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231
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223
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214
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31,062
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6,792
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4,982
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2,349
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1,279
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1,129
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995
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542
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537
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509
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503
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444
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268
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212
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206
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195
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147
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146
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139
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137
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130
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73
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68
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61
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58
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57
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45
United States
21,386
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5,838
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5,247
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5,014
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4,079
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1,276
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1,081
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896
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692
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604
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550
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547
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491
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440
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430
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415
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391
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307
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287
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282
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279
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263
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222
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221
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211
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207
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205
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196
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33,137
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20,387
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17,579
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1,471
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838
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555
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410
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410
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400
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303
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280
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179
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57
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6
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4
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15,968
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14,698
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5,020
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1,664
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1,556
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1,475
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1,359
1923 Publications
Works whose copyright expired on January 1, 2019, and that are now in the public domain in the U.S.