Exploration Fawcett [clearly, from the evidence of this link, there's also a whacko fringe Fawcett-cult] - I can't put it down. Imagine Poe's Pym novel, except in real life, with a great deal more of detailed description & episodes, & the wisdom of experience & humane spirit. It ends with Fawcett's disappearance in the depths of the Amazon jungle. Notebooks compiled by his son - who is looking out his office window in the railroad yard in Lima Peru at the very railroad car his father was riding into the Andes (on his first expedition) the day he (his son) was born, back in London. Very Poe/Borgesian touch, there.

The Amazon (along with Vallejo & the Andes) creeps into the final passages of Forth of July - mingled strangely with The Countess from Minneapolis (ps. that cover image is a painting of Hennepin Ave) & Pushkin's short story "The Queen of Spades".

"...by the shores of great rivers" (Mandelstam)

But the fit though very few who read to the very deep end of Forth of July may traverse a thin quipu-bridge to The Countess from Minneapolis, by Barbara Guest (all mixd up with the Queen of Spades in Pushkin's sht stry) (logorithm: guest-geist-ghost-ghoul-gould) published in Providence by Burning Deck Press. to wit (from the Hebrew):

17
There are mzqtz in La Pz
nd at Crgdero we lst a hrs
to a jgr btfly mggt in the ml's
rs fr shr nd the Cntss zps

hr lps th rfinmt ov wht's spcl
tks plc btwn th mt nd th bn,
n'est-ce pas? sd Sgnr Rbnri
th lngthy slw ckng ov th Chldrn's

Op. "Lntls" Th puma wz nthr stry.
Io Zagreus! Th puma, th lnx, Actn, Xn. . .
sldrs, mchn gns, drg dgs snffng lgg. . .
Hrmn hs gn md hz n Wrd 17

fr a bd actn lk Npln r Jls Czr
hz flc wz fxt t th pnpt
b th ghst he trpt upn
th ghst ov th Cntss rzr-

shrp shp lght nd frry eye
th Cntss n hr cnrty hs smth mst
wshng hrslf nkd n th strm-strm
fr tht th fthr v hz cntry (Yoi W)

sht thru wth hr frtvfr
ovrt th clft he gs bncng lk
a yoi-yoi fr lkng
nlwfly n awfly cldly frtvly

twrd the Cntss cvrd wth mzqtz
thr nr Qto whr th mngld gld
ov lmn nd wmbn r = sgns r gthrd
tgthr in th bk ov hr mrkbx (qtzlctlq)