TY  - BOOK
AU  - Johnson, P S
TI  - The Economics of invention and innovation: with a case study of the development of the hovercraft
SN  - 0-85520-0782
U1  - 607.2 21st
PY  - 1975///
CY  - London
PB  - Martin Robertson
KW  - Technological innovation; Ground-effect machines
ER  -