Κανονική προβολή Προβολή MARC Προβολή ISBD

Field work in ecology for secondary schools in tropical countries ; edited by P.J. Kelly. - [S.l.]: Unesco, [19--]. - 273 p. : ill. ; 28 cm. - 30 .

Subjects--Topical Terms:
Ecology--Study and teaching

Dewey Class. No.: 333.7071