I picked up a (IIRC ArtScroll) sidur (prayer book) in my synagogue one day. It had no indication of ownership in it, but it had some handwritten notes (all in the same hand). Among them were:
- Between the blessing "גאל ישראל" and the blessing "השכיבנו" during weekday maariv: "normally, Shimona Esrei should immediately follow גאל, but see vol 10, ¶ 97"
- On the words "כנגד כלם" in the passage after the morning blessings on the Tora: "study of Torah = all the mitzvahs above vol 7 p 205"
What multi-volume book is referred to here?