Text ( visual ) : unmediated Health and safety education / Deobold B. Van Dalen. -- Washington : Center for Applied Research in Education , 1963. -- ix, 117 p. ; 24 cm. -- (The library of education). -- Bibliography: p. 109-110. -- (BA07064424) ; https://ci.nii.ac.jp/ncid/BA07064424 Author Heading(s): Van Dalen, Deobold B.. -- Classification(s): LCC : LB3405 ; DC : 375.613. -- Subject Heading(s): LCSH : Health education