Fields-Picklo Vs Drummond Catalog

Some background. I collect Cinderellas from philatelic clubs, organizations and events from 1930 to 1939. Starting in the 30's thru the 50's collecting was in its heyday.

Since starting, I've used the Fields-Picklo listing as my guide. Over time I've discovered that there are a number of issues that are not on their list. That started me thinking, is there a better catalog or listing that is more comprehensive? I've read that the Drummond catalog is a better guide, but its costs is a major drawback. Plus I haven't seen any collectors or sellers using it as a guide.

So I guess my question is, is there a better list/catalog than Fields-Picklo??

You answered your own question before you wrote the above at the end of your post. Cost is the issue you mention. The prices for the Drummond (RIP James) works seems in line with other similar printed volumes given the page counts and quality. Have you tried the APS library to see if they have what you want? If they do and you are not a member it may be worth it to join.