Vegetation classification and map of the central Siskiyou Mountains, OregonRobert E. Frenkel · First published 1984Open the Tome
Vegetational changes in the Willamette River Greenway in Benton and Linn Counties, 1972-1981Robert E. Frenkel · First published 1983Open the Tome
Preserve analysisGregg L. Bonacker, Robert C. Martin, Robert E. Frenkel · First published 1979Open the Tome
Transition zone vegetation between intertidal marsh and upland in Oregon and WashingtonRobert E. Frenkel · First published 1978Open the Tome
Tidal datums and characteristics of the upper limits of coastal marshes in selected Oregon estuariesRobert E. Frenkel · First published 1976Open the Tome
Comparison of traditional phytosociological and numerical classificatory methods and their uses in ecologyRobert E. Frenkel · First published 1973Open the Tome
Ruderal vegetation along some California roadsidesRobert E. Frenkel · First published 1970Open the Tome
Treading vegetation on Costa Rican soccer fieldsRobert E. Frenkel · First published 1970Open the Tome
