I see that Archive.org has the short novel The Greatest Adventure (February 1929, as reprinted in Famous Fantastic Mysteries for June 1944).

The plot (below) has some resemblance to Lovecraft’s At The Mountains of Madness. Though the only Lovecraftian comment I can find, on this interesting 1920s ‘lost race’ / ‘dinosaur survival’ combo-tale, is in the one-page introduction to its reprint in Price’s The Antarktos Cycle: Horror and Wonder at the Ends of the Earth (2006).

My plot-spoilers follow…

A whaler brings a monstrous lizard-thing to a famous scientist in California. An ice-quake in Antarctica had torn a mysterious and huge petroleum-slicked sea-passage into the heart of the frozen continent. The sailor had followed this passage, and thus found the weird lizard-thing he now shows. He also saw boulders incised with strange lizard-shaped hieroglyphs. The scientist & co. set out for Antarctica, where they find what the sailor has described. Two of the party then fly inland and from above they spy a lush green valley with giant lizard-things in it. The petroleum is partly aflame and has melted the ice, revealing the caverns below. The revealed valley also has an enormous tunnel at one end, into which the explorers fly in their plane… only to be attacked by flying lizard-things from deeper under the earth. Meanwhile, the scientist deciphers the hieroglyphs, and learns that millions of years ago a new form of life was created by an alien race, but that this new life proved impossible to control. Antarctica was then sealed to stop the alien-engineered life from infecting the planet. The boulders with the hieroglyphs were then placed around Antarctica as a ‘warning to the future’. Meanwhile, the plane explorers have blasted open a cave entrance, which has released plant-spores they think are harmless. But in the night these spores become a fast-growing plant which envelops their plane. They extricate the plane with difficulty. Thankfully the plot has provided the leaking raw petroleum (usefully held in a natural dam) which is needed to swamp and kill the noxious alien life-forms. The petroleum flood is released and set on fire, and thus the dangerous plant-spores and lizard-things are utterly destroyed. The explorers escape and the world is saved.

Somewhat similar to Lovecraft… Antarctica as a setting, mysterious stone hieroglyphs to be translated, telling of ancient aliens who artificially create ‘Frankenstein’ life-forms they could not control, but which it turns out are still very real and menacing. However, the 1929 book seems to have passed with hardly a trace. For instance, judging by Google Books the book The Search for E.T. Bell: Also Known as John Taine appears to have been able to note only one review in a California student journal. There was however one New York Times supplement review in March 1929, a review which August Derleth spotted and mentioned in passing to Lovecraft in a letter (“a lost world of horror under the Antarctic ice”) though did not send as a cutting. This aside, and the quality of the review source, would surely have had Lovecraft enquiring at the local library to see if the review could be found in the recent back-copies. However, S.T. Joshi states… “It does not appear that Lovecraft ever read Taine” (Letters to Robert Bloch, page 15). But, I’d suggest it’s not impossible that he read the 3rd March 1929 NYT review. I regret I can locate no free copy of that review, at present.

The 1944 reprint of The Greatest Adventure appeared after Lovecraft’s death, and today it can also be found on Project Gutenberg in handy readable ebook formats.