A concept which, as has already been pointed out, can be traced back to the early Egyptian civilization.

The concept of a national museum dedicated to African American history and culture can be traced back to the second decade of the 20th century.

The concept of sustainable development can be traced to the energy (especially fossil oil) crisis and the environment pollution concern in the 1970s.

The concept of successful aging can be traced back to the 1950s, and was popularized in the 1980s.

The concept can be traced back to the 1960s.

The concept can be traced through English common law and is recognised in all European legal systems.

While initially used for swimming and fishing, the concept of building a formal park along the river can be traced to the 1920s.

The concept of the cryosphere can be traced back to this monogram.

The concept of the big bang can be traced back to the discovery of the microwave background radiation in 1965.

The concept of establishing a long-term human presence on the Moon can be traced back to the late 1950s.