Text ( visual ) : unmediated Field natural history : a guide to ecology / written and illustrated by Alfred Leutscher. -- London : G. Bell , 1969. -- 248 p : illus., maps ; 26 cm. -- Bibliography: p. [239]-244. -- ISBN 0713515325 ; (BA22891010) ; https://ci.nii.ac.jp/ncid/BA22891010 Author Heading(s): Leutscher, Alfred. -- Classification(s): LCC : QH541 ; DC : 574.5. -- Subject Heading(s): LCSH : Ecology ; LCSH : Ecology -- Great Britain ; LCSH : Epping Forest (England : Forest)

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