Author

Daniel Sommerfeldt

3 books found

Cover of Bicycling Bobs

Bicycling Bobs

Daniel Sommerfeldt · First published 2021

Cover of Precis of Natural Systems

Precis of Natural Systems

Daniel Sommerfeldt · First published 2014

Cover of Disquisition on Natural Systems

Disquisition on Natural Systems

Daniel Sommerfeldt · First published 2012