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Two postcards kept in the Alexander collection document the activities of one of the respected Hebrew teachers who worked in the city of Kraków at the beginning of the 20th century. Shevah Volkovsky developed a unique method for learning Hebrew by correspondence, through which he spread the knowledge of the language to many students in Europe.

On April 30, 1930, Belgium Post issued its first airmail stamps.
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The stamp collector who wishes to derive the most enjoyment from the item he has purchased is not satisfied with a superficial examination of the stamp’s content, but strives to carefully examine all the elements of the design and identify all the items of information incorporated into it.

The recording of the total monetary value of the denominations in a row (or column) of a stamp sheet. The total is recorded in the margin of the sheet. This practice is intended to make it easier for postal clerks to cut the number of stamps they need from the sheet.

An envelope sent on the island of Trinidad documents an attempt by the local charity to collect donations for the Red Cross during World War I. The course of events turned this activity into a philatelic curiosity.