Monday and Tuesday within the Octave of Pentecost are both Doubles of the First Class, from Wednesday to Saturday the days are ranked as semi-double rite.
On Monday everything is sung as on the feast. There is only one nocturn at Mattins (c.f. the Octave of Pascha). The versicle and response before the lessons are proper to the day. The Gospel pericope is from the tenth chapter of St. John and the homily is from St. Augustine. At Lauds the antiphons and psalms as sung on the feast are used, the antiphon on the Benedictus and collect are proper.
At the Hours all is as on the feast. The Pentecost Doxology is sung at the conclusion of the hymns, at Terce the hymn is Veni, Creator.
Mass is sung after Terce. The formulary is proper for each day within the Octave. The Gloria is sung, there is one collect, the Sequence is sung, the Creed is sung, the preface, Hanc igitur and communicantes are of Pentecost.
Vespers are as on the feast, the antiphon on the Magnificat is proper.
In the 'liturgical books of 1962' there are few differences than usual (except of course for the standard ones in the Office and Mass e.g. bows to the altar Cross, repititon of texts, the Confiteor before Communion etc). The Pentecost Doxology is omitted at the Hours and at the Hours the antiphons are doubled.