A national park was proposed early in the 20th century.

Because this theory was proposed in the past century before complete genomes were sequences, it could not be fully tested for nearly 30 years.

Excellent review of solutions proposed in the 19th century.

This first hexadecimal system, proposed in the 19th century, has thus far not achieved widespread usage.

The route has a length of 10,228 km and was first proposed in the late 19th century.

Many different versions of infinitary logic were proposed in the late 20th century.

Several dates for the original observations, as contained in the tablet, were proposed early in the 20th century.

Payne was reflecting historians and other researchers who still proposed this theory in the nineteenth century.

"The idea was first proposed by Earth scientists in the late twentieth century," Data replied.

The New Deal policies drew from many different ideas proposed earlier in the 20th century.