Rian, first of all.: Welcome to Typophile, I may as well tell you that I am a fan of your work, then..

You may have already noticed, seen and read some of these.:
> www.itcfonts.com/ulc/article.asp?sid=PULWCD7F6DG09H11WGKWEJFN07BN7G1C&sec=ulc&issue=articles&art=excoffon
> www.myfonts.com/person/excoffon/roger/
> www.linotype.com/7-388-7/rogerexcoffon.html

Sadly enough, it seems pretty hard to find decent information, details and / or listings of his work..

Hey Rian, nice to see you hanging about...

I have a couple of Fonderie Olive specimen books with a bunch of Excoffon designs. I could probably scan a post portions of them if you'd like.

In the meantime, there is also this partial visual index of Excoffon's work from the Klingspor Museum Offenbach:

http://www.klingspor-museum.de/KlingsporKuenstler/Schriftdesigner/Excoffon/RExcoffon.pdf

Grant, Olive, ooooh please.

Rian, some print stuff:
1) S Carter's "20th Century Type Designers" has a page of his fonts.
2) Issue #12-OldSeries of Herbert Spencer's Typographica has a killer article on Mistral, including highly varied initial sketches that contain many ideas for many unreleased fonts.

And here's a thread you might enjoy:
http://www.typophile.com/forums/messages/30/1405.html

hhp

FontShop's list