Some analysts have delimited the baby boom period differently. Authors William Strauss and Neil Howe, in their 1991 book "Generations", define the social generation of boomers as that cohort born from 1943 to 1960, who were too young to have any personal memory of World War II, but old enough to remember the postwar American High before John F. Kennedy's assassination. In Ontario, Canada, David Foot, author of "Boom, Bust and Echo: Profiting from the Demographic Shift in the 21st century" (1997), defined a Canadian boomer as someone born from 1947 to 1966, the years in which more than 400,000 babies were born. However, he acknowledges that that is a demographic definition, and that culturally, it may not be as clear-cut. French sociologist Michèle Delaunay in her book "Le Fabuleux Destin des Baby-Boomers" (2019), places the baby boom generation in France between 1946 and 1973, and in Spain between 1958 and 1975. Doug Owram argues that the Canadian boom took place from 1946 to 1962, but that culturally boomers everywhere were born between the late war years and about 1955 or 1956. Those born in the 1960s might feel disconnected from the cultural identifiers of the earlier boomers. The Office for National Statistics has described the UK as having had two baby booms in the middle of the 20th century one in the years immediately after World War II and one in around the 1960s with a noticeably lower birth rate (but still significantly higher than that seen in the 1930s or later in the 70s) during part of the 1950s. Bernard Salt places the Australian baby boom between 1946 and 1961.