https://scholarworks.uni.edu/pias/vol9/iss1/25/
"The Vascular Cryptogams of Iowa and the Adjoining Parts of Southeaster" by L. H. Pammel and...
During the past year an excellent paper on Iowa Pteridophyta, by Prof. Shimek, has appeared. This paper gives the distribution of the Iowa Pteridophytes as...
https://lod.nal.usda.gov/nalt-core/en/page/?uri=https%3A%2F%2Flod.nal.usda.gov%2Fnalt%2F6349
NAL Agricultural Thesaurus: NALT Core: cryptogams
nalagriculturalthesauruscorecryptogams
https://www.vedantu.com/question-answer/are-ferns-called-vascular-cryptogams-class-11-biology-cbse-60ea94ae150cd84f25409240
Why are Ferns called Vascular Cryptogams class 11 biology CBSE
Why are Ferns called Vascular Cryptogams
fernscalledvascularcryptogamsclass