Observing, photographing, and collecting plants Robertson, Kenneth Ray, 1941- creator Illinois. Natural History Survey Division contributor text book Urbana, [Ill] Illinois Natural History Survey 1980 1980
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ENG Collection and preservation Identification Photography of plants Plants Circular (Illinois. Natural History Survey Division), no. 55 https://www.biodiversitylibrary.org/bibliography/46166 7350739 10.5962/bhl.title.46166 SPI