Books listed by ISBN
>
Georgi
> Helmut Knotig
Helmut Knotig
Helmut Kuntz
title
ISBN-13
(ISBN-10)
year of publication
Human Ecology 1975: International Meeting Proceedings
978-2-6O4-OOO27-3
(2-6O4-OOO27-X)
1977
Helmut Knüpffer