The Scofield Bible Commentary, by Cyrus Ingerson Scofield, , at sacred-texts.com
The writings of Jeremiah in chapters 30 to 36, cannot with certainty be arranged in consecutive order. Certain dates are mentioned (for example (Jer 32:1); (Jer 33:1); (Jer 34:1); (Jer 34:8); (Jer 35:1) but retrospectively. The narrative, so far as Jeremiah gives a narrative, is resumed at (Jer 37:1). These chapters constitute a kind of summary of prophecy concerning Israel as a nation, looking on especially to the last days, the day of the Lord, and the kingdom-age to follow. If the marginal references are carefully followed the order will become clear. But these prophecies are interspersed with much historical matter concerning Jeremiah and his time.
Three "writings" by Jeremiah are to be distinguished:
(1) This is impersonal -- a general prophecy, and probably the earliest. (Jer 30:1-31); (Jer 30:40).
(2) The prophecy destroyed by Jehoiakim. (Jer 1:1-36); (Jer 1:23).
(3) The destroyed writing re-written doubtless the writing preserved to us. (Jer 36:27).
(See Scofield) - (Mic 5:1).