Directory of audio-visuals on the environment

Θέματα: “…Environmental sciences-Audio visual aids-Directories…”

Mathematics through paper folding ανά Olson, Alton T.

Θέματα: “…Mathematics-Study and teaching-Audio-visual aids…”

A manual of audio-visual technique ανά Dekieffer, R.E

Θέματα: “…Audio visual aids…”

Administering audio-visual services ανά Erickson, Carlton W.H

Θέματα: “…Audio visual aid…”