Published in Raptor Research, in 1974, in volume 8, issue 1/2, pages 1-5

Published in Raptor Research, in 1974, in volume 8, issue 1/2, pages 6-10

Published in Raptor Research, in 1974, in volume 8, issue 1/2, pages 11-19

Published in Raptor Research, in 1974, in volume 8, issue 1/2, pages 20-28

Published in Raptor Research, in 1974, in volume 8, issue 1/2, pages 29-32

Published in Raptor Research, in 1974, in volume 8, issue 1/2, pages 33-36

Published in Raptor Research, in 1974, in volume 8, issue 3/4, pages 45-57

Published in Raptor Research, in 1974, in volume 8, issue 3/4, pages 60-66

Published in Raptor Research, in 1974, in volume 8, issue 3/4, pages 67-72