La asombrosa diversidad de la naturaleza /

by Young, Allen Marcus 1942-, Young, Allen Marcus 1942-
Published 1985

Observations on the life cycle of Heliconius hecale zuleika (Hewitson) in Costa Rica

by Young, Allen Marcus 1942-, Young, Allen Marcus 1942-
Published 1975

Mimetic associations in natural populations of tropical papilionid butterflies.

by Young, Allen Marcus 1942-, Young, Allen Marcus 1942-

Feeding behavior of Morpho butterflies (Lepidoptera: Nymphalidae: Morphinae) in a seasonal tropical enviroment. /

by Young, Allen Marcus 1942-, Young, Allen Marcus 1942-

Flowering and fruit-setting patterns of cocoa trees (Theobroma cacao L.) (Sterculiaceae) at three localities in Costa Rica /

by Young, Allen Marcus 1942-, Young, Allen Marcus 1942-

Foraging of vampire bats (Desmodus rotundus) in Atlantic wet lowland Costa Rica.

by Young, Allen Marcus 1942-, Young, Allen Marcus 1942-

The chocolate tree : a natural history of cacao /

by Young, Allen Marcus 1942-
Published 1994

Sarapiquí chronicle : a naturalist in Costa Rica /

by Young, Allen Marcus 1942-
Published 1991

An illustrated field guide to the natural history of Costa Rica /

by Young, Allen Marcus 1942-
Published 1981

Population biology of tropical insects /

by Young, Allen Marcus 1942-
Published 1982

Sarapiquí chronicle : a naturalist in Costa Rica /

by Young, Allen Marcus 1942-
Published 2017

Costa Rica : nature, prosperity, and peace on the rich coast /

by Young, Allen Marcus 1942-
Published 1984

Geographical and ecological expansion in tropical butterflies of the genus Morpho in evolutionary time /

by Young, Allen Marcus 1942-, Young, Allen Marcus 1942-, Muyshondt, Alberto