1. Lichens;Ahmadjian;Annu. Rev. Microbiol.,1965
2. Lichens;Ahmadjian,1966
3. A lichenometrical study of the northwestern margin of the Barnes Ice Cap: A geomorphological technique;Andrews;Geogr. Bull.,1964
4. “Phytosociology and Ecology of Cryptogamic Epiphytes”;Barkman,1958
5. Lichenometrie im Gletschervorfeld;Beschel;Ver. Schutze Alpenpfl. Tiere München.,1957