Hypnerotomachia Poliphili, called in English Poliphilo's Strife of Love in a Dream or The Dream of Poliphilus, is a romance said to be by Francesco Colonna, first published in Venice in 1499.
Prints from the original version, written in a mixture of Italian and Latin, can be found at Category:Hypnerotomachia Poliphili.
1549 version (Jean Martin)
Hypnérotomachie, ou Discours du songe de Poliphile, is the first French-language version, edited by Jean Martin (1546). It is an adaptation and not a literal translation. It contains original prints which are stored at Category:Hypnérotomachie, as well as below in page order.
1883 version (Claudius Popelin)
Le Songe de Poliphile, French traduction of Hypnerotomachia Poliphili by Claudius Popelin, 1883, is a more literate translation of the original version. However it reuses illustrations from the 1549 version (see above), as well as specific ornaments which are stored at Category:Le Songe de Poliphile - trad. Popelin.
In order to easily find the best version for each decorative letter, the following gallery shows all decorative letters used in the 1549 version (and which are reused in the 1883 version).
Complete print list
This list shows all prints from the 1546 version, in page order. You may notice the acrostic message written by the decorative letters: POLIAM FRATER FRANCISCUS COLUMNA PERAMAVIT.
The first column contains links to the French 1883 edition on Wikisource, which includes all of these images.