The real publication came out in the 70s I believe...Duck care has drastically changed since then...No revised version that I know of in recent years...?...
Cheers!
There has actually been a revised version of this book...I have it and it states the same as casportpony linked above. It was revised by Dave Holderread in 2001 and again in 2011, the latter being the version I have.
Thank you!
Revised or republished..?.....