The Book of Jubilees by R.H. Charles
The Book of Jubilees also called the Little or Lesser Genesis is considered a pseudepigrapha book by Protestants and Catholics. Some groups both Jewish and Christian consider it a canonical book.
It was well known and read by early Christians because the early Christian writers quoted from the book of Jubilees.
The book itself parallels the book of Genesis and early part of Exodus from the Creation to the Passover.
The chronology given in Jubilees is based on multiples of seven; the Jubilees are periods of 49 years (seven "year-weeks"), into which all of time has been divided.
The book offers some interesting commentary on the Genesis and Exodus.