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-rw-r--r--src/date.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/date.c b/src/date.c
index c0ca4c990..313c7f913 100644
--- a/src/date.c
+++ b/src/date.c
@@ -39,7 +39,7 @@
**
** Jean Meeus
** Astronomical Algorithms, 2nd Edition, 1998
-** ISBM 0-943396-61-1
+** ISBN 0-943396-61-1
** Willmann-Bell, Inc
** Richmond, Virginia (USA)
*/