Due to the lack of record keeping in early times, most of the history is not well documented until the year 1500.

This practice was not documented in the West until the early-18th century, and was used on a very limited basis.

While sports psychology began to be studied around the 1920s, the study and use of hypnosis was not documented until the 1950s.

Little substantial evidence of man's relationship with the European rabbits is documented until the medieval period.

But it was not documented by public health officials until 1996.

This was documented by individual teachers in rural areas of the Chronicle themselves until 1939.

However the town layout was not documented until 1855.

The construction is anyway not documented until the middle of the 15th century, including a substantial renovation in late Gothic style.

Fax art was first faxed in 1980, but that was not documented until 1985.

Its presence in the latter country was not documented until 1989/1990.