na YOGYA-02090000063538 20090227040211.0 ind 010-020900000063538 926 Cro S CROWTHER, J.G Six graet inventors by J.G. Crowther London Hamish Hamilton 1954 235 hlm ilus 19 cm Bibliografi : hlm. 235 Biografi J.G. Crowther YOPDYOG (B) 02-09-06 1 a000006291