Calexit- The AnthologyJ L Curtis, Lawdog, Cedar Sanderson, Bob Poole, Alma Boykin, B Opperman, L B Johnson, Tom Rogneby, Kimball O'Hara, Eaton Rapids Joe · First published 2017Open the Tome
FloodplainsJeffrey J. Opperman, Peter B. Moyle, Eric W. Larsen, Joan L. Florsheim, Amber D. Manfree · First published 2017Open the Tome
The Later Stone Age of the Drakensberg Range and its foothillsH. Opperman · First published 1987Open the Tome
Jean-Baptiste Oudry Sixteen Eighty-Six to Seventeen Fifty-FiveHal N. Opperman, Hal Opperman · First published 1983Open the Tome
