911.3
B 
Bengtson , Nels Augusto , 1879-
Fundamentals  of  economic   grogrphy , by  Nels  A.  Bengtson  and  Willian Van   Roywn. Rev .  ed.   New York , Pretica -Hall inc .,   1942.
xxvii, 602. ilus  . mapas . diagr.  24  cm