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oops -re: shells in gravel

I made a large error in my last post on gravel
containing shells:  Where I wrote ppm when
measuring KH and GH, I of course meant degrees
hardness (dH).
Sorry about that.

Please note new email address:

Roxanne Bittman, Botanist
Natural Diversity Database
CA Dept. of Fish and Game
1220 S Street
Sacramento, CA  95814
Phone:  (916) 323-8970
Fax:       (916) 324-0475
Internet:  rbittman at hq_dfg.ca.gov