This is a collection of 40 stamps. The countries that the stamps in this collection were issued in are Asia, the USA, Oman, Great Britain, Venezuela, Ethiopia, Vietnam, Yugoslavia, China, Syria, Mongolia, United Arab Republic, New Zealand, Germany, Denmark, Romania, Bangladesh and Laos. The oldest stamp in this collection was issued in 1940. The newest stamp in this collection was issued in 1993. The decades the stamps were issued in are the 1940s, 1950s, 1960s, 1970s, 1980s and 1990s. Some of the stamps in this collection have been unused. Many of the stamps have been used. This can be seen with some of the postmark on them, and a little of the envelope that they were originally attached to still on the back. Some of the stamps are a little faded. Three of the stamps from Great Britain celebrate show Aberystwyth University, Essex University and Southampton University. One the stamps from Great Britain celebrates the invention of Radar. The stamps from New Zealand celebrates Antarctic Geology Research. Three of the stamps from the USA celebrate Aviation Pioneers. They celebrate the work of Alfred V.Verville, Orville and Wilbur Wright, and Octave Chanute. One of the stamps from the USA celebrate the Space Fantasy Space Capsules. One of the stamps from the celebrates the Apollo Soyuz Space Test Project. One of the stamps from the USA celebrates the work of Astronauts. One of the stamps from the USA celebrates the work of the Army and Navy. One of the stamps from the USA celebrates the use of light. The stamp from Ethiopia celebrates the 2nd International Conference on the Global impacts of Applied Microbiology. The stamp from Mongolia celebrates Oceanography. One of the stamps from Venezuela celebrates the Teleferique and mountain transport. One of the stamps from Venezuela celebrate the 2nd Inter-America Conference of the Ministries of Work. The stamp from Laos celebrates the discovery of space. The stamp from Vietnam celebrates the exploration of space. The stamp from Bangladesh celebrates the work of the Fenchuganj Factory that makes fertilizer. The stamp from Denmark celebrates the invention of the wheel. Two stamps from Germany celebrate the invention of the telescope. One of the stamps from Germany celebrates the invention of light technology. The stamps from the United Arab Republic celebrates Industry. One of the stamps from the United Arab Republic celebrates the work of cranes in transporting heavy loads. The stamp from Romania celebrates the invention of the telephone. The stamp from the former Yugoslavia celebrates the work of dams. The stamp from Oman celebrates academic knowledge. The stamp from Syria celebrates industry and agriculture. The stamps from China celebrate the invention of vaccinations, industry and agriculture. The stamp from the USSR celebrates industry.