@misc{_XX._1958,
 number={20},
 copyright={Public Domain},
 address={Kórnik},
 howpublished={online},
 year={1958},
 language={mul},
 title={XX. Index Seminum Anno 1958 Collectorum Quae Instituti Arboretum Pro Mutua Commutatione Offer},
 type={Text},
 URL={http://www.rcin.org.pl/Content/186730/PDF/KOR001_168100_1958_XX-Index-Seminum-An.pdf},
 keywords={catalog of seeds, seeds of trees and shrubs, seed exchange, Kórnik Arboretum},
}