Quoting the Geomatters FB page:

If you didn't see the announcement yesterday, we were shocked at the sudden passing of Trail Guide author, Debbie Strayer. Geography Matters is a small, family run business and most of the folks involved in the business have worked together and been friends for years. We ask for your patience and understanding if your calls and emails take a little longer to get answered this week. Please keep the Geography Matters family, particularly Debbie's husband and children, in your prayers.