Hi Linda
To help you better define what you may or may not be getting into.
Here is my .2 cents
Leslie
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Kira & Habe’s works are very nice.  There are several revision as shown below.
Revisions correct errata and add marginal content.  But as afore mentioned, it
is very outdated…. I like the books themselves, and as a matter of opinion, an
old name is better than no name.  I have seen them as much as $125.00 for a
nice set.

Kira, Tetsuaki  -  1st Ed  1965   /  Revised 3rd Ed 1971
Shells of the Western Pacific in Color, Vol I, Hoikusha Press, 224 pp, 1270
cil, 72 cpl, DJ HB(L)

Habe, Tadashige – 1st Ed  1964   /  Revised Ed 1968
Shells of the Western Pacific in Color, Vol II, Hoikusha Press, 233 pp, 11457
cil, 66 cpl, DJ HB(L)

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Keen Produced 2 major works, each with 2 editions as shown below.
Sea Shells of Tropical West America 2nd Ed is back in print at $90.00 List
The content and page count greatly varies between the works as shown below:

Keen, Myra A. & James McLean 1971 –
Sea Shells of Tropical West America: Marine Mollusks from Baja California to
Peru, 2nd Ed, Stanford, 1080 pp, 22 cpl, 3325 il, 4 map, HB(M)

Keen, Myra A. 1958 –
Sea Shells of Tropical West America: Marine Mollusks from Lower California to
Columbia, 1st Ed, 2nd Pr 1960, Stanford, 625 pp, 10 cpl, HB(M)

Keen, Myra A. & Eugene Coan 1974 –
Marine Mollusca Genera of Western North America: An Illustrated Key, 2nd Ed
(1963), Stanford, 208 pp, 1963 il, DJ HB(M)

Keen, Myra A. & Eugene Coan 1963 –
Marine Mollusca Genera of Western North America: An Illustrated Key, 1st Ed,
Stanford, 126 pp, 1963 il, HB(M)