📚🔖🔢

#book index #back of book #library catalog #reference lookup #page number #non-fiction index

📄🔍¹

#source check #fact check #reference lookup #citation detail #document source #small print #footnote detail

📚📇#

#book index #library catalog #card index #information retrieval #reference lookup

🔖#️⃣

#booking number #reference lookup #reservation tag #confirmation identifier #bookmark code #retrieve booking