http://www.digitalearth.gov has been crawled 184 times going all the way back to December 17, 1999.

A crawl can be a duplicate of the last one. It happens about 25% of the time across 420,000,000 websites. FAQ
Jan

January 1, 2006

1 snapshot

1
2
3
4
5

January 6, 2006

1 snapshot

6

January 7, 2006

1 snapshot

7

January 8, 2006

1 snapshot

8

January 9, 2006

1 snapshot

9

January 10, 2006

1 snapshot

10

January 11, 2006

2 snapshots

11

January 12, 2006

6 snapshots

12

January 13, 2006

5 snapshots

13

January 14, 2006

1 snapshot

14

January 15, 2006

2 snapshots

15

January 16, 2006

3 snapshots

16
17

January 18, 2006

1 snapshot

18
19
20
21
22
23
24

January 25, 2006

1 snapshot

25

January 26, 2006

1 snapshot

26

January 27, 2006

1 snapshot

27

January 28, 2006

1 snapshot

28
29
30
31
Feb
1
2
3
4

February 5, 2006

1 snapshot

5

February 6, 2006

1 snapshot

6
7

February 8, 2006

1 snapshot

8

February 9, 2006

1 snapshot

9
10
11
12
13
14

February 15, 2006

1 snapshot

15

February 16, 2006

1 snapshot

16
17
18

February 19, 2006

1 snapshot

19
20

February 21, 2006

1 snapshot

21

February 22, 2006

1 snapshot

22

February 23, 2006

1 snapshot

23
24
25
26
27
28
Mar
1
2
3

March 4, 2006

1 snapshot

4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

March 28, 2006

1 snapshot

28
29
30
31
Apr
1
2
3
4

April 5, 2006

1 snapshot

5
6
7
8

April 9, 2006

1 snapshot

9

April 10, 2006

1 snapshot

10
11

April 12, 2006

1 snapshot

12

April 13, 2006

1 snapshot

13
14
15
16
17
18

April 19, 2006

1 snapshot

19
20
21
22
23

April 24, 2006

1 snapshot

24
25
26
27
28
29
30
May
1
2
3
4
5
6

May 7, 2006

1 snapshot

7
8
9

May 10, 2006

1 snapshot

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Jun
1
2
3
4
5
6
7
8
9
10
11
12
13
14

June 15, 2006

1 snapshot

15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Jul
1
2
3
4

July 5, 2006

1 snapshot

5
6
7
8

July 9, 2006

1 snapshot

9
10
11
12
13

July 14, 2006

1 snapshot

14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Aug
1
2
3
4
5
6
7
8
9

August 10, 2006

1 snapshot

10

August 11, 2006

1 snapshot

11

August 12, 2006

1 snapshot

12

August 13, 2006

1 snapshot

13

August 14, 2006

1 snapshot

14

August 15, 2006

1 snapshot

15
16
17
18

August 19, 2006

1 snapshot

19
20
21

August 22, 2006

1 snapshot

22
23
24
25
26
27
28
29
30
31
Sep

September 1, 2006

1 snapshot

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Oct
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Nov
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Dec
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

Note

This calendar view maps the number of times http://www.digitalearth.gov was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.