TY  - BOOK
AU  - Byrd,Eldon A.,1939-.
TI  - How things work: practical guide for teaching scientific and technical principles 
SN  - 0134356446
PY  - 1973///
CY  - West Nyack, N.Y.
PB  - Parker Publishing Company
KW  - Science
KW  - Study and teaching
KW  - Technology
KW  - Methodology
N1  - Includes bibliographies
ER  -