Nice acquisition. I suspect there is probably someone lurking on the site who has a specialty in the Mariana Islands. Beginning with Spanish and German issues, through Japanese and US.
I'm a member of the Highpointers Club (
www.highpointers.org ). Earlier this year, several Club members made the summit on Agrihan in the Northern Mariana Islands. This was the last unclimbed high point of any US state or territory; at least the first recorded ascent.