Perhaps you've also went thru this website
http://www.dpaa.mil/portals/85/Docum...orwald_all.pdf.
Only B-29 that seems to fit the picture is 42-93974 on 9 Nov 1951 on a night leaflet mission. But then, without a more precise location or date from the book, it now is just a suggestion...
Regards,
Leendert