Russia is characterized as a reddish-brown calfskin impregnated with birch bark oil.
A popular binding material in the late Eighteenth century, it is rarely met with today as it tends to deteriorate badly.
Ref: 122799/2006-10-11
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(#)The daily puzzle:
What does '*****' mean in the following text?
"The *****, or more precisely, the volumetric mass *****, of a substance is its mass per unit volume. Different materials usually have different densities, and ***** may be relevant to buoyancy, purity and packaging."
The answer and more