@book{Steffen1978, author="Hans Steffen and Werner Dubach and U. Geiser", title="Final Report of the Airphoto Interpretation Project of the Swiss Technical Co-Operation Service, Berne", year="1978", publisher="Swiss Technical Co-Operation Service and the Central Planning Organization", address="Zurich and ana", keyword0="Census", keyword1="Education", keyword2="Geography", keyword3="Government", keyword4="History", keyword5="Literacy", keyword6="Physical", keyword7="YAR", type="book" }