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Pertti Pelto

P.P. ยท Pertti J. Pelto

titleISBN-13
(ISBN-10)		year of publica-
tion		other author(s)
Technology and Social Change978-O-O2-3O9O1O-3
(O-O2-3O9O1O-3)		1972H. Russell Bernard

Pertti Pesonen