Published in Raptor Research, in 1972, in volume 6, issue 1, pages 1-3
Published in Raptor Research, in 1972, in volume 6, issue 1, pages 4-5
Published in Raptor Research, in 1972, in volume 6, issue 1, pages 6-10
Published in Raptor Research, in 1972, in volume 6, issue 1, pages 11-15
Published in Raptor Research, in 1972, in volume 6, issue 1, pages 16-41