books

Books about Poortman:

booksLeven en werken van J.J. Poortman by Klever W.N.A. (1971)

wiki

Wiki information Poortman:

Johannes Jacobus Poortman
Philosopher, Person, Deceased Person

Johannes Jacobus Poortman, studied philosophy and psychology at Groningen University under Professor Gerardus Heymans. In 1919 he received his Master of Arts; many years later he would also earn a Ph.D.. He was also a theosophist. Poortman studied at...

Guzmania poortmanii
Biological Species, Organism Classification

Guzmania poortmanii is a species of plant in the Bromeliaceae family. It is endemic to Ecuador. Its natural habitat is subtropical or tropical moist montane forests. It is threatened by habitat loss.