The distinction between group and stage was made in the second part of the 20th century, when stratigraphers saw the need to distinguish between litho- and chronostratigraphy.
For the first two years the paper was commercially printed but in 1979 production became entirely in-house with the purchase of an off-set litho press.
An increase in the cost of litho functions with the introduction of advanced next-generation technologies is an emerging trend in the lithography system market.
No official paper industry definition exists for glossy, semi-matte, etcetera, although an objective scale is available for the glossiness of papers used in offset litho printing.
Many famous artists were contacted to design those series of cards, which were first produced using true lithography, then litho chromo, chromolithography and finally offset printing.