Assertion: lsd's use | /r/CapableOf | start by early 1960s
Facets:
Source sentences:
text: Its use as a recreational agent started by the early 1960s and popularity continued into the early 1970s.
text: Its use as a recreational agent started by the early 1960s and popularity continued into the early 1970s.
text: Its use as a recreational agent started by the early 1960s and popularity continued into the early 1970s.