Hydraulic experiments with valves, orifices, hose, nozzles, and orifice buckets.

Mode of access: Internet.

Proportional registration, the Western system for licensing interstate motor vehicle fleets, a brief history and explanation.

Cover title.

Valves and valve-gearing : a practical text-book for the use of engineers, draughtsmen, and students.

Mode of access: Internet.

Fairbanks valves ... illustrated catalogue and price list

Mode of access: Internet.

Proportional representation,

"Select bibliography": p. 514-517.

Proportional representation review

Mode of access: Internet.