.245
a	Time measurement
b	: an introduction history
h	Buku-Bacaan Pengaya Nonfiksi
.020
a	0715354817
.100
a	WELCH, Kenneth F.
.005
a	20090827102329
.260
a	London
b	David and Charles
c	1972
.084
a	529 WEL
.300
a	v, 120 hllm.: gamb., tab.
b	22 cm
c	v, 120 hllm.: gamb., tab.; 22 cm
.336
a	Buku-Bacaan Pengaya Nonfiksi