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Official source · Urban Farm DB

U.S. Senate, Committee on Foreign Relations — Exec. Rpt. 105-15, Convention for the Protection of Plants (UPOV 1991)

This source is cited by the column “The law came in 1930 and patent number one went to a climbing rose — rights over plant varieties were built in under a century.” This page records the connection before you continue to the external source.

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The law came in 1930 and patent number one went to a climbing rose — rights over plant varieties were built in under a century →
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U.S. Senate, Committee on Foreign Relations — Exec. Rpt. 105-15, Convention for the Protection of Plants (UPOV 1991) — Urban Farm DB