A. Johnsen

Phenological and Environmental Observations on Stands of Orthotrichum anomalum

A. Johnsen, 1969 .

Plumage colour in nestling blue tits: sexual dichromatism, condition dependence and genetic effects

B. Kempenaers, K. Delhey, S. Andersson, 2003, Proceedings of the Royal Society of London. Series B: Biological Sciences.

Catalog of the Lichens of Arizona

T. H. Nash, A. Johnsen, 1975 .

Bryophytes New to Arizona from the White Mountains

D. Vitt, A. Johnsen, 1971 .