Published in Raptor Research, in 1973, in volume 7, issue 2, pages 25-31

Published in Raptor Research, in 1973, in volume 7, issue 2, pages 32-38

Published in Raptor Research, in 1973, in volume 7, issue 2, pages 39-42

Published in Raptor Research, in 1973, in volume 7, issue 2, pages 49-54

Published in Raptor Research, in 1973, in volume 7, issue 2, pages 62

Published in Raptor Research, in 1973, in volume 7, issue 2, pages 63

Published in Raptor Research, in 1973, in volume 7, issue 3/4, pages 73-77

Published in Raptor Research, in 1973, in volume 7, issue 3/4, pages 78-96

Published in Raptor Research, in 1973, in volume 7, issue 3/4, pages 107-108

Published in Raptor Research, in 1973, in volume 7, issue 3/4, pages 109-111

Published in Raptor Research, in 1973, in volume 7, issue 3/4, pages 112-115