. . "Sciences naturelles." . . "Naturalesa Estudio." . . "Nature study." . . "Sciences naturelles Recherche." . . "Nature Étude et enseignement Guides, manuels, etc." . . "Naturwissenschaften." . . "Nature Étude et enseignement." . . "Historia Natural." . . "Naturalesa Estudio Bibliografía." . . "Nature study-handbooks, manuals" . . "Science." . . . "Handbook of nature-study"@en . . "Lehrbuch" . . . . . "Handbook of nature study"@en . . . "Hanbook of nature-study" . . "Handbook of nature-study for teachers and parents based on the Cornell nature-study leaflets with much additional material and many new illustrations"@en . . . . "Handbook of nature-study for teachers and parents : based on the Cornell nature-study leaflets with much additional material and many new illustrations"@en . . . . . . . . "Handbook of Nature-Study"@en . "Handbook of Nature-Study" . . . "Handbook of nature-study" . "Handbook of nature-study"@en . . . "Handbook of nature study" . "Handbook of nature study"@en . . . . "Provides lessons on many topics of nature study, with questions that may form the basis for student projects." . . . "Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets"@en . "Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets" . . . . "Bibliography"@en . "Bibliography" . "Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets, with much additional material and many new illustrations"@en . "Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets, with much additional material and many new illustrations" . . . "Handbook of nature-study for teachers and parents"@en . "Handbook of nature-study : for teachers and parents : based on the Cornell nature-study leaflets, with much additional material and many new illustrations"@en . . . "Handbook of nature-study for teachers and parents : based on the Cornell nature-study leaflets, with much additional material and many new illustrations"@en . "Handbook of nature-study for teachers and parents : based on the Cornell nature-study leaflets, with much additional material and many new illustrations" . . . . . . . . . . . . . . . . . . . . "Handbook of nature-study for teachers and parents based on the Cornell nature-study leaflets, with much additional material and many new illustrations"@en . . . . "Handbook of nature study for teachiers and partents"@en . . . "Handbook of nature-study; for teachers and parents. Based on the Cornell nature-study leaflets, with much additional material and many new illustrations"@en . . . . "Handbook of nature - study"@en . . . . . "Handbook of nature study for teachers and parents" . "Handbook of nature study for teachers and parents"@en . . . "Handbook of nature study : for teachers and parents" . . . . . . . . . "Handbook of nature-study for teachers and students, based on the Cornell Nature-Study Leaflets, with much additional material and many new illustrations"@en . . . . . . . . "Handbook of nature-study : for teachers and parents, based on the Cornell nature-study leaflets, with much additional material and many new illustrations"@en . . "Handbook of nature-study for teachers and parents, based on the Cornell nature study leaflets, with much additional material and many new illustrations" . . . . . . . . "Handbook of nature-sutudy" . . "Nature-study" . . . . . . . . "Handbook of nature-study for teachers and parents : based on the Cornell nature-stury leaflets"@en . . . . . . . .