@misc{_XIX._1957,
 number={19},
 copyright={Public Domain},
 address={Kórnik},
 howpublished={online},
 year={1957},
 language={mul},
 title={XIX. Index Seminum Anno 1957 Collectorum Quae Instituti Arboretum Pro Mutua Commutatione Offer},
 type={Text},
 URL={http://www.rcin.org.pl/Content/186727/PDF/KOR001_168099_Collectorum-Quae-Inst-Arb-1957.pdf},
 keywords={catalog of seeds, seeds of trees and shrubs, seed exchange, Kórnik Arboretum},
}