Barter
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bill Clinton
Anubis.
There were no Greek coins produced in 1940 (actually, none between 1931 and 1953), so presumably you are talking about a bill. As a collectible, the bill's value would depend on its condition. As a matter of foreign exchange, approximately zero. The drachma is no longer in use, having been replaced by the Euro in 2002 (at a rate of 340.75 drachmas = 1 Euro). As of May 13, 2011, the Euro is worth US$1.4140. This implies that the exchange rate of 10 drachmas would be US$0.041496, or about 4 cents. However, that refers to the third modern drachma, in place since about 1954, replacing the second modern drachma at 1000 to 1. The second modern drachma, meanwhile, had replaced the first modern drachma at a rate of 50,000,000,000 to 1 in 1944 (there was some fairly severe hyper-inflation in Greece during World War II). Thus 10 1940-era drachmas would have an exchange rate (if they were still in fact exchangable, which they're not) value of 0.041496/1000/50000000000, which equals US$0.00000000000000082993397, or about 83 quadrillionths of a US cent ( a "quadrillionth" is a millionth of a billionth). As I said, approximately zero.
other forms governments replaced it.
Barter
Barter
it wasn't replaced
From the times of the Etruscans (they invented them) to about 700 years ago when they were gradually replaced by the Hindu-Arabic numeral system.
Libraries
pickaxes.
maritime trade
Every tractor is different, and the most commonly replaced part will vary depending on the make and use of the tractor. However, commonly replaced tractor parts include air filters, spark plugs, belts and wheels.
in your @SS !!
blackhole
Field Replaceable Units
There isn't one. The Euro replaced the deutchmark