Inside Out Library · Explore
The Rohrbach "ROCCO:" seaplane : new German commercial seaplane with two Rolls-Royce "Condor" engines (1927)
NASA Technical Reports Server (NTRS) · leaf 7

NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
More pictures from The Rohrbach "ROCCO:" seaplane : new German commercial seaplane with two Rolls-Royce "Condor" engines
More like this