Flash drive so you can share it easier and have a backup for yourself. Beats carrying your computer all the time. I collect all over but am selling some this year and concentrating on my core or favorites but also picking up some I see I like and would like to go. Such as Texas, Louisiana, Florida, more Cuba. Trying also to fill my 1st edition Las Vegas and Tahoe Collection. Stop by an Show me your collection. I'll be a dealer at the show. tormor33@icloud.com Post some pages on the board !!! Torrey