["Nature \/ General","Science \/ General","Grassland animals;United States;Identification.","Grassland ecology;United States;Handbooks, manuals, etc.","Grasslands;United States;Handbooks, manuals, etc.","Grassland animals;United States;Identification.","Grassland ecology;United States;Handbooks, manuals, etc.","Grasslands;United States;Handbooks, manuals, etc.","Nature \/ General","Science \/ General"]