Bert (A.H.) Roos: Llyn Cau with Cader Idris in the background
Bert (A.H.) Roos: European herring gull portrait
Bert (A.H.) Roos: Competition
Bert (A.H.) Roos: Juvenile European herring gulls
Bert (A.H.) Roos: Lyn Cau seen from Cader Idris.tif