--subdivision Collection and preservation under kinds of natural objects, including plants, animals, and antiquities, for works on methods of collecting and preserving these objects, e.g. Fishes--Collection and preservation; subdivision Conservation and restoration under types of art objects, library materials, types of architecture, etc., for works on preserving and restoring these items, e.g. Newspapers--Conservation and restoration; and subdivision Preservation under perishable products, including types of foods, drugs, textiles, etc., e.g. Corn--Preservation
--names of specific materials and forms, e.g. Magnesium alloys; Plates (Engineering); also subdivision Testing under specific materials or forms, e.g. Concrete--Testing; Girders--Testing
--subdivision Surfaces under individual chemicals and groups of chemicals and individual materials and types of materials, e.g. Copper--Surfaces; Metals--Surfaces
