.14-221 printed info and articles found so far:



Handbook for Shooters and Reloaders, Volume 2 by P.O. Ackley mentions .14-221 Walker developed by Dave Walker (haven't read this one yet)



Wildcat Cartridges: Combo Edition By Wolfe Publishing (haven't read this one yet either)



Eichelberger .14 caliber manual by Bill Eichelberger



The Handloader Magazine, May-June 1968 vol. 3-no. 3-p. 14, Now a .14 caliber rifle by Maj. George Nonte, also mentioned is Walker Rifle Barrel Co., Louisville, KY



Small Caliber News, spring 1998 vol.1-no.1-p.6, Those crazy little .14 calibers by Bill Eichelberger



Small Caliber News, fall 1999 vol.2-no.3-p.32, .14-221 Eichelberger by Todd A. Kindler



Small Caliber News, spring 2000 vol.3-no.1-p.25, 14 for 14 with a .14 by Blaine Eddy



Thinking about building a 14? by Russ Lucas