Aero Vintage Books

Hobbs 26
Hobbs 27
Hobbs 29

Hobbs 47
Hobbs 59

Great! These are all at Kingman, right?
#29 and #59 have the more common oversized tail number; I haven't found a closeup of the smaller/bolder version yet.
I think these are all the NMF B-17G Hobbs tail numbers we've found so far:

#10 – 42-102894
#26 – unknown (at Kingman)
#27 – unknown (at Kingman)
#29 – unknown (at Kingman)
#38 – 43-37758 (at Kingman)
#47 – 44-XXXX (at Kingman)
#59 – unknown (at Kingman)
#72 – unknown (cheek guns)
#75 – unknown
#92 – unknown (at Kingman)
#98 – 42-102895 EDIT: #88

The Hobbs Facebook page has images from a pilot's logbook - unfortunately it only listed plane type and engine type; no column for plane numbers.

#88 - 42-102895

88? Looks like you're right; there's a scratch in the microfilm that made it look like a 9.

two more possible (no large nose number - which Lockbourn would have had)

Hobbs 64 (staggered waist, no pumpkin)
Hobbs 77 (staggered waist, no pumpkin)

From accident report 45-6-8-13

Hobbs H-56 is 42-31942