Current issues in the design and information content of instrument approach chartsRobert John Hansman · First published 1995Open the Tome
Type Graptolithina in Field Museum of Natural HistoryRobert H. Hansman · First published 1979Open the Tome
Supplement to the Catalog of the type specimens of fossils in the University of Cincinnati MuseumRobert H. Hansman · First published 1962Open the Tome
