This is a clipping of W.G. Rogers’ (circa 1973) review of Gravity’s Rainbow (click on the image to enlarge it). The marginal annotation is by William Gaddis:
Rogers’ review of Gravity’s Rainbow is eleven paragraphs long in two columns. The final three paragraphs are devoted to a comparison with The Recognitions (this comparison takes up about three quarters of the second column). Rogers refers to Gaddis’s novel as Recognitions.
The final paragraph reads:
Gaddis could have written Gravity’s Rainbow and Pynchon could have written Recognitions [sic].That two hearts can beat as one is no proof two minds can. Would we not expect Gaddis to use his own respected name? Could there be two separate master hands? I suppose so, but…
Gaddis published his second novel J R, two years later, in 1975.
This document is part of the William Gaddis Papers collection at Washington University. I saw it earlier this morning thanks to Reddit user Signor Mantissa.