Charlie,
As the proverbial "cone head" my preferences for references (clever rhyme - eh?) are;
Danker Vink's treatise on Western Atlantic Conidae in La Conchiglia
RK & K Manual of the Living Conidae
Walls' Cone Shells
Alan Kohn's Chronological Taxonomy of Conus 1758-1840
Coomans, Moolenbeek & Wils Alphabetic Revision of the (sub)species in Recent Conidae - in BASTERIA
Springsteen & Leobrera - Shells of the Philippines
Barry Wilson - Australian Marine Shells
Reeve's Conchologia Iconica - Conus monograph
Ed Petuch's New Caribbean Molluscan Faunas
Sowerby's Conchological Illustrations
And of course the serial publications like The Nautilus, Veliger, Gloriamaris, Basteria etc.
Wayne Harland
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"The trouble with doing something right the first time
is the no one realizes how difficult it really was."