1949. Allen, Paul H.. Flora of Panama. Part III. Fascicle I. Annals of the Missouri Botanical Garden (2): 133-257. | Google Scholar |
1952. Allen, P.H.. The Swan Orchids: A Revision of the Genus Cycnoches ; I - IV. (): . | Google Scholar |
1952. Allen, P.H.. A Preliminary Index to the Trees of the Golfito-Palmar Area. (): . | Google Scholar |
1953. Allen, P.H.. The Orchids of Panama: Annotated Check-list of Genera and Species. (): . | Google Scholar |
1956. Allen, P.H.. The Rain Forests of Golfo Dulce. (): . | Google Scholar |
1964. Allen, P.H.. The Timber Woods of Panama. (): . | Google Scholar |
1964. Hodge, W. H.. Paul Hamilton Allen, 1911. Taxon (3): 73-77. | Google Scholar |
1965. Williams, L.O. and P.H. Allen. Orchidaceae. (): . | Google Scholar |
1965. Allen, P.H.. Annotated Index of Philippine Musaceae. (): . | Google Scholar |
1977. Allen, P.H.. The Rain Forests of Golfo Dulce. (): . | Google Scholar |
1978. Howard, Richard A. and Paul H. Allen. REVIEW OF: The Rain Forests of Golfo Dulce, Paul H. Allen. Arnoldia (2): 62-62. | Google Scholar |
1980. Williams, L.O. and P.H. Allen. Orchids of Panama: with a checklist of orchids of Panama as known today. (): . | Google Scholar |
1981. Butzin, Friedhelm, L. O. Williams and P. H. Allen. REVIEW OF: Orchids of Panama, L. O. Williams, P. H. Allen. Willdenowia (1): 182-183. | Google Scholar |