The volume is a commentary presenting texts from the 1493 Linkoping Breviary (GW 5373); the Upsala Missals of 1484 (WB 1609), and 1513 (WB 1610); the Abo Missal of 1488 (WB 1); the 1531 Swedish Mass of Olavus Petri (with English trans.); the 1571 'Church Order' of Laurentius Petri (with English trans.); the Mass of King John III (Red Book') (Latin and Swedish); the 1602 Communion Office of King Charles IX (Swedish with English trans.); and the 1917 Eucharistic Order (in Swedish with English trans.).