Quote:
I think Rod has already started his own worldwide catalog. He just hasn't published it yet.

Thanks HB.
About 12 years ago, I was trying to get members of a Stamp Newsgroup, to get together, and make a collaborative work that would do similar.
Here's how it would have worked.
Between agreeable members, one would scan mint, or excellent examples of their stamps, at a preferable 600 dpi.
Name the scans by issue date. year/month/day eg: 19340302
Values with leading zeroes eg: 02h (2 heller)
Topic eg Chopin
So any scan would be entitled eg: 19340320 02h chopin (Say Austria)
We could then have a world trade/exchange in Stamp Scans.
Say for Russia with 6000 scans, we could each get a full catalogue of scans within a year or so.
We could see posts like
"Trade : Have 1964-1967 (200) full set of scans for Ghana : trade for 3 years or 100 scans Montenegro"
It sounded so obvious to me, one could get a WW set of scans within 5 years or so of trading.
It never took off
The trade could have expanded to, Cinderellas, revenues, postmarks, etiquettes,
varieties, forgeries, etc & etc.