1.
Cepheid Variable [Pi] Aquilae : The Eclipsing Binary [sigma] Aquilae...
by Wylie, Charles Clayton
ISBN: 9781277006810
List Price: $15.75
2.
Cepheid Variable [Pi] Aquilae : The Eclipsing Binary [Sigma] Aquilae
by Wylie, Charles Clayton
ISBN: 9781346443331
List Price: $19.95