I was recently asked what is the suggested reading order for Philip José Farmer's Khokarsa series when you include the short story and two novellas along with the three novels. I've also been asked to put a comprehensive checklist of the series together linking to where the stories and novels can be purchased. So that's exactly what you'll find below.
I should also note upfront that several of the stories below overlap one another. The Song of Kwasin and "Kwasin and the Bear God" begin just after the events of Hadon of Ancient Opar, and The Song of Kwasin runs synchronously with (and beyond) the events of Flight to Opar. Further, "A Kick in the Side" begins just after Chapter 19 of Flight to Opar, and "Kwasin and the Bear God" is set between Chapter 1 and Chapter 2 of The Song of Kwasin. Sounds complicated, but if you read all the stories, it's all clear and makes sense. I've also included Time's Last Gift, a prelude to the main series, to the list. And for the compulsively obsessed chronologists, I've included the year or years when each story tales place, designated in both B.C. (Before Christ) and A.T. (After Temple, i.e., after the founding of the Temple of Kho at Khokarsa; see Farmer's Chronology of Khokarsa). Follow the linked titles to where you can purchase each story (note: the three novels of the Khokarsa trilogy are due out in a few short weeks in the omnibus Gods of Opar: Tales of Lost Khokarsa, which can be read and enjoyed either with or without reference to the other works in the series).
Khokarsa series suggested reading order:
Time’s Last Gift (novel): 12,000 B.C.–2073 A.D.
Exiles of Kho (novella): 10,812 B.C.–10,810 B.C. (788 A.T.–790 A.T.)
Hadon of Ancient Opar (novel): 10,011 B.C.–10,009 B.C. (1589 A.T.–1591 A.T)
Flight to Opar (novel): 10,009 B.C.–10,008 B.C. (1591 A.T–1592 A.T.)
“A Kick in the Side” (short story): 10,009 B.C. (1591 A.T.)
“Kwasin and the Bear God” (novella): 10,009 B.C. (1591 A.T.)
The Song of Kwasin (novel): 10,009 B.C.–10,004 B.C. (1591 A.T.–1596 A.T.)