This service, which will first show Clays and Clay Minerals content from mid-February 2019, and which will contain the entire journal archive by end-Spring 2019, requires that you login at The CMS site
Username = Your Email Address
Password = Your Member ID
Your Member ID is a 5 or 6 digit code that appears on the mailing label for the journal, on the line above your name.
If you do not know what Email Address you have given CMS or your correct Member ID, contact the CMS Dues and Subscriptions Office (firstname.lastname@example.org).