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no cover found
by: Valjakka, Risto.

In: Natura. - ISSN 0355-7863. - Helsinki : Biologian ja maantieteen opettajien liitto. - 33 (1996) : 3, s. 45-46
Journal article
no cover found
by: Valjakka, Risto.

In: Natura. - ISSN 0355-7863. - Helsinki : Biologian ja maantieteen opettajien liitto. - 33 (1996) : 2, s. 44-45
Journal article
no cover found
by: Valjakka, Risto.

In: Natura. - ISSN 0355-7863. - Helsinki : Biologian ja maantieteen opettajien liitto. - 32 (1995) : 1, s. 45-46
Journal article

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