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A preliminary list of the vascular flora of Allegheny County, Pennsylvania - Shafer, John Adolph, 1863 -1918 (Carnegie Institute Museum?, 1901)

Preliminary report on the alfalfa weevil. [Phytonomus posticus] - Webster, F. M. (Francis Marion), 1849 -1916 (Govt. print. off, 1912)

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[Price list] : all seeds offered comply with your state law and are tagged accordingly - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Courteen Seed Company, 1922)

[Price list] : April 1st, 1902 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (N.L. Willet Drug Co, 1902)

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The principles of biology - Spencer, Herbert, 1820 -1903 (D. Appleton and Co, 1874)

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The principles of biology - Spencer, Herbert, 1820 -1903 (D. Appleton and Company, 1866)

The principles of biology - Spencer, Herbert, 1820 -1903 (D. Appleton and company, 1898)

The principles of biology - Spencer, Herbert, 1820 -1903 (D. Appleton, 1896)

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