Top of page
Skip to main content
Library of Congress
Search
Everything
Audio Recordings
Books/Printed Material
Films, Videos
Legislation
Manuscripts/Mixed Material
Maps
Notated Music
Newspapers
Periodicals
Personal Narratives
Photos, Prints, Drawings
Software, E-Resources
Web Archives
Web Pages
3D Objects
Search
Search toggle
menu
Discover
Services
Visit
Education
Connect
Shop
external link
Donate
About
Ask a Librarian
Help
Contact
Search Online Catalog
Copyright.gov
Congress.gov
Share
Book/Printed Material
Image 21 of An experimental study of sleep
Back to Search Results
About this Item
Image
Image w/Text
PDF
Image
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21 of 124
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
Go
Pages
Previous Page
Next Page
View
Single image
List
Gallery
Grid
Slideshow
Go
