Odonata -- Conservation -- Germany -- Rhineland-Palatinate : Artenschutzprogramm für die Gekielte Smaragdlibelle (Oxygastra curtisii, Insecta, Odonata) in Deutschland : das Beispeiel der Population an der Our / Jürgen Ott [and others]
Here are entered general works on the conservation of all forms of energy. Works on the conservation of energy as a physical concept are entered under Force and energy --subdivision Energy conservation under types of industries, facilities, etc., e.g. Construction industry--Energy conservation
Here are entered works on the preservation and careful use of food, especially in war time. Economic works on the availability of food are entered under Food supply
--subdivision Habitat--Conservation under individual animals and plants and groups of animals and plants, e.g. Fishes--Habitat--Conservation; Corn--Habitat--Conservation