A Monograph on the Fossil Balanidæ and Verrucidæ of Great Britain
(engl.)
at The Complete Work of Charles Darwin Online
[darwin-online.org.uk/content/frameset?itemID=F342.2&viewtype=side&pageseq=1]

A Monograph of the Fossil Lepadidae; or, Pedunculated Cirripedes of Great Britain
(engl.)
at The Complete Work of Charles Darwin Online
[darwin-online.org.uk/content/frameset?itemID=F342.1&viewtype=side&pageseq=1]

A Monograph of the Sub-class Cirripedia, with Figures of All the Species. The Lepadidae; or, Pedunculated Cirripedes
(engl.)
at at Google ricerca libri
[books.google.com/books?hl=it&lr=&id=QPctx7W_G58C&oi=fnd&pg=PA1&dq=%22Darwin%22+%22A+Monograph+on+the+Sub-class+Cirripedia:+With+Figures+of+...%22+&ots=KGqi5TSM6Y&sig=kT9l0J_kEplGrihh50IzTyA58vw#PPP8,M1]

Insectivorous Plants
(engl.)
at Project Gutenberg
[www.gutenberg.org/dirs/etext04/insec10.txt]

The Descent of Man and Selection in Relation to Sex
(engl.)
at Project Gutenberg
[www.gutenberg.org/dirs/etext00/dscmn10.txt]

The Descent of Man and Selection in Relation to Sex
(it.: M. Lessona)
at Liber Liber
[www.liberliber.it/biblioteca/d/darwin/index.htm]

The Effects of Cross and Self-fertilisation in the Vegetable Kingdom
(engl.)
at Project Gutenberg
[www.gutenberg.org/dirs/etext03/csfvk10.txt]

The Effects of Cross and Self-fertilisation in the Vegetable Kingdom
(it.: G. Canestrini, P. A. Saccardo)
at Liber Liber
[www.liberliber.it/biblioteca/d/darwin/index.htm]

The Expression of the Emotions in Man and Animals
(engl.)
at Project Gutenberg
[www.gutenberg.org/dirs/etext98/eemaa10.txt]

The Expression of the Emotions in Man and Animals
(engl.)
at University of Virginia
[etext.virginia.edu/toc/modeng/public/DarExpr.html]

The Expression of the Emotions in Man and Animals
(it.: G. Canestrini, F. Bassani)
at Liber Liber
[www.liberliber.it/biblioteca/d/darwin/index.htm]

The Formation of Vegetable Mould, through the Action of Worms
(engl.)
at Project Gutenberg
[www.gutenberg.org/dirs/etext00/vgmld10.txt]

The Formation of Vegetable Mould, through the Action of Worms
(it.: M. Lessona)
at Liber Liber
[www.liberliber.it/biblioteca/d/darwin/index.htm]

The Foundations of “Origin of Species”
(engl.)
at The Complete Work of Charles Darwin Online
[darwin-online.org.uk/content/frameset?itemID=F1556&viewtype=side&pageseq=1]

The Movements and Habits of Climbing Plants
(engl.)
at Project Gutenberg
[www.gutenberg.org/dirs/etext01/cplnt10.txt]

The Movements and Habits of Climbing Plants
(it.: G. Canestrini, P. A. Saccardo)
at Liber Liber
[www.liberliber.it/biblioteca/d/darwin/index.htm]

The Origin of Species
(engl.)
at Bartleby.com
[www.bartleby.com/11/]

The Origin of Species (ed. I 1859)
(engl.)
at The Complete Work of Charles Darwin Online
[darwin-online.org.uk/content/frameset?itemID=F373&viewtype=side&pageseq=1]

The Origin of Species (ed. VI 1872)
(engl.)
at The Complete Work of Charles Darwin Online
[darwin-online.org.uk/content/frameset?itemID=F391&viewtype=text&pageseq=1]

The Origin of Species
(french, ed.: Barbier)
at Abu
[cedric.cnam.fr/ABU/cgi-bin/go?espece1]

The Power of Movement in Plants
(engl.)
at Charles Darwin
[charles-darwin.classic-literature.co.uk/the-power-of-movement-in-plants/]

The Power of Movement in Plants
(it.: G. Canestrini, F. Bassani)
at Liber Liber
[www.liberliber.it/biblioteca/d/darwin/index.htm]

The Variation of Animals and Plants Under Domestication
(engl.)
at Electronic Scholarly Publishing
[www.esp.org/books/darwin/variation/facsimile/title3.html]

The Variation of Animals and Plants Under Domestication
(it.: G. Canestrini)
at Liber Liber
[www.liberliber.it/biblioteca/d/darwin/index.htm]

The Various Contrivances by Which Orchids are Fertilized by Insects
(engl.)
at Google ricerca libri
[books.google.com/books?hl=it&lr=&id=JRVg5eaquIYC&oi=fnd&pg=RA1-PR16&dq=%22Darwin%22+%22The+Various+Contrivances+by+Which+Orchids+Are+Fertilized+...%22+&ots=duc9rK1Fgv&sig=keZM45UWDqHEGb5Sa_YrXf_uUuQ#PPP1,M1]

The Various Contrivances by Which Orchids are Fertilized by Insects
(it.: G. Canestrini, L. Moschen)
at Liber Liber
[www.liberliber.it/biblioteca/d/darwin/index.htm]

The Voyage of the Beagle
(engl.)
at Bartleby.com
[www.bartleby.com/29/]

The Voyage of the Beagle (ed. XI 1913)
(engl.)
at Sacred Texts
[www.sacred-texts.com/aor/darwin/beagle/vob00.htm]

The Voyage of the Beagle
(engl., ed.: D. Appleton, New York 1871)
at GASL
[www.gasl.org/refbib/Darwin__Beagle.pdf]

The Voyage of the Beagle
(it.: M. Lessona)
at Liber Liber
[www.liberliber.it/biblioteca/d/darwin/index.htm]