Published in Raptor Research, in 1983, in volume 17, issue 1, pages 1-8

Published in Raptor Research, in 1983, in volume 17, issue 1, pages 9-14

Published in Raptor Research, in 1983, in volume 17, issue 1, pages 15-27

Published in Raptor Research, in 1983, in volume 17, issue 1, pages 27-28

Published in Raptor Research, in 1983, in volume 17, issue 1, pages 29-30

Published in Raptor Research, in 1983, in volume 17, issue 2, pages 33-37

Published in Raptor Research, in 1983, in volume 17, issue 2, pages 37-42

Published in Raptor Research, in 1983, in volume 17, issue 2, pages 43-56

Published in Raptor Research, in 1983, in volume 17, issue 2, pages 57-62

Published in Raptor Research, in 1983, in volume 17, issue 2, pages 62

Published in Raptor Research, in 1983, in volume 17, issue 3, pages 65-76

Published in Raptor Research, in 1983, in volume 17, issue 3, pages 77-84

Published in Raptor Research, in 1983, in volume 17, issue 3, pages 84-91

Published in Raptor Research, in 1983, in volume 17, issue 3, pages 91

Published in Raptor Research, in 1983, in volume 17, issue 3, pages 92

Published in Raptor Research, in 1983, in volume 17, issue 3, pages 93

Published in Raptor Research, in 1983, in volume 17, issue 3, pages 94

Published in Raptor Research, in 1983, in volume 17, issue 4, pages 97-113

Published in Raptor Research, in 1983, in volume 17, issue 4, pages 114-121

Published in Raptor Research, in 1983, in volume 17, issue 4, pages 122