1970

Keywords.Photographers.Dell O Clark, Keywords.Places.Los Angeles County.Rio Hondo River, Keywords.Weeds.Alligatorweed (Alternanthera philoxeroides), Keywords.Weeds.Ratings.A Rated, Keywords.Year.1970

Keywords.Photographers.J P Clark, Keywords.Places.San Francisco County, Keywords.Weeds.Biddy-biddy (Acaena novae-zelandiae), Keywords.Weeds.Ratings.A Rated, Keywords.Year.1970

Keywords.Photographers.S Clark, Keywords.Places.Monterey County.Priest Valley, Keywords.Weeds.Ratings.A Rated, Keywords.Weeds.Thistles.Scotch Thistle (Onopordum acanthium), Keywords.Year.1970

Keywords.Places.Los Angeles County.Rio Hondo River, Keywords.Weeds.Alligatorweed (Alternanthera philoxeroides), Keywords.Weeds.Ratings.A Rated, Keywords.Year.1970

Keywords.Places.Los Angeles County.Rio Hondo River, Keywords.Weeds.Alligatorweed (Alternanthera philoxeroides), Keywords.Weeds.Ratings.A Rated, Keywords.Year.1970

Keywords.Places.Los Angeles County.Whittier Narrows Golf Course, Keywords.Weeds.Alligatorweed (Alternanthera philoxeroides), Keywords.Weeds.Ratings.A Rated, Keywords.Year.1970, Keywords.Year.1971

Keywords.Photographers.J P Clark, Keywords.Places.Modoc County.Alturas, Keywords.Weeds.Austrian Field Cress (Rorippa austriaca), Keywords.Weeds.Ratings.B Rated, Keywords.Year.1970

Keywords.Photographers.Dell O Clark, Keywords.Places.San Bernadino County.Hinkley, Keywords.Weeds.Camelthorn (Alhagi camelorum), Keywords.Weeds.Ratings.A Rated, Keywords.Year.1970

Keywords.Photographers.Dell O Clark, Keywords.Places.Los Angeles County.Rio Hondo River, Keywords.Weeds.Alligatorweed (Alternanthera philoxeroides).Specimens - Roots, Stems, etc, Keywords.Weeds.Ratings.A Rated, Keywords.Year.1970