I love hybids but have learned to read the pages carefully. Am not really into the letterboxing thing but enjoy the hybribs and was happy when I could find a babyfoot stamp at Marden's. I had a stamp pad and the footprints - well I thought it fit. As for references for things found in caches - that is easy as there are links to contact everyone on line. As long as they log - and read their accounts - they are reachable. Have learned to love the hybrids and look forward to more.