Your science fair: an opportunity for youth; a guidebook to successful science exhibits, by Arden F. Welte, James Dimond [and] Alfred Friedl. Science fair. Welte, Arden F. Science fairs. Q105 .W4 1962 500.074 WEY Minneapolis, Burgess Pub. Co. 1962. 1962. 1962 Text 161 p. : eng