by William van Royen in cooperation with Bureau of Agricultural Economics, U.S. Department of Agriculture
Prentice-Hall, for the University of Maryland1954Atlas of the world's resources / University of Maryland, Department of Geography, College of Business and Public Administration
v. 1
by William van Royen, Oliver Bowles ; in collaboration with Elmer W. Pehrson
Prentice-Hall, for the University of Maryland1952Atlas of the world's resources / University of Maryland, Department of Geography, College of Business and Public Administration
vol. 2
