Upvote:6
I have found full list of proto-cuneiform signs (very large file [93 MB]), with very detailed glyphs together with their meanings sadly meanings seems to be all missing. Though there is no author information.
Also as you suggested; A. Falkenstein, Archaische Texte aus Uruk (Archaische Texte aus Uruk 1; Berlin-Leipzig 1936)
from Cuneiform Digital Library Initiative website.
Another alternative, though without meanings again; Proto-Cuneiform Signs by Ashur Cherry