"The bridges are unrailed, and many of them are made by placing two or
more logs across the stream, laying twigs across, and covering these
with sods, but often so scantily that the wild rush of the water is seen
below.  Primitive as these bridges are, they involve great expense and
difficulty in the bringing of long poplar logs for great distances along
narrow mountain tracks by coolie labour, fifty men being required for
the average log."  Isabella Bird, Amoung the Tibetans

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