Here are entered works on home greenhouse plant culture. Works on the commercial growing of plants in greenhouses and on the management of the greenhouses themselves are entered under Greenhouse management.
Here are entered works on equipment used to provide medical care. Works on equipment that provides the user with a safe supply of air or oxygen in an environment where air is unavailable or unsafe to breathe are entered under Breathing apparatus.
Here are entered works on artificial satellites in general and on the satellites orbiting around Earth. Works on artificial satellites of other celestial bodies are entered under Artificial satellites subdivided by the name of the body, e.g. Artificial satellites--Sun.This heading may be subdivided geographically only by names of celestial bodies. --names of individual artificial satellites