A history of Manitowoc CountyRalph G. Plumb · First published 1904 · Latest edition 2018Open the Tome
History of the navigation of the Great LakesRalph Gordon Plumb · First published 1911 · Latest edition 1964Open the Tome
the horizon book of the renaissancej.h. plumb , morris bishop, garrett mattingly, kenneth clark, ralph roeder, j. bronowski, iris origo, h.r. trevor-roper, denis mack smith, maria bellonci · First published 1961Open the Tome
History of the Oberlin-Wellington rescueJacob R. Shipherd, Ralph Plumb, Henry E. Peck · First published 1859Open the Tome
