Larry, thanks for pointing out the history book, and Stig thanks for posting there what he had inside.
The American Battle Monument Comission website confirms that Branscombe was lost on the 8th, as did the various MACR lists available here and there.
The Ybbs listed on the book should be Ybbs an der Donau (
http://maps.google.fr/maps?hl=fr&q=Y...-8&sa=N&tab=wl).
Both MACR indicate that the losses took place at Pöchlarn, ten km east of this location (
http://maps.google.fr/maps?hl=fr&q=P...-8&sa=N&tab=wl). By the way the railway following the Danube is passing in both these places.
The now defunct website "Losses over Yugoslavia" was listing all four CR 42 losses over Croatia, and the three shot down by P-38 in the Zagreb/Agram-Gorica area.