KEY : links to Bird Observer online edition links to Bird Observer pdf edition (registered users only)
June 1973, Vol. 1, No. 3 Goshawks 1972-73 Leif Robertson Manomet Bird Observatory Brian Harrington Birding on Plymouth Beach Bruce Sorrie Robert Cushman Murphy Leif Roberson Peregrine Update Leif Roberson The "Blue List" The Bird Observer Summary for March/April 1973 ^ top
links to Bird Observer online edition 
links to Bird Observer pdf edition (registered users only)