[Hygienic problems of modern school textbooks].
D000293:Adolescent; D000367:Age Factors; D001877:Books; D001878:Books, Illustrated; D002648:Child; D006801:Humans; D011327:Printing / Q000592:standards; D011932:Reading; D012572:School Health Services; D014586:USSR
Gigienicheskie problemy shkol'nogo uchebnika na sovremennom étape