When Blackrobes first brought the Roman Rite to the New World interior, cardstock didn't wear very well in the wilderness.
 
Instead, the North American Martyrs would have used bookmarks like these: supple, 4-5oz leathers, tough enough to endure but thin enough to avoid damaging book bindings while enclosed between pages. This pack of three includes one of each of the three designs shown.
 
Love that old book smell? Add a rich leather smell to your next pilgrimage in poetry or prose.