In the days before pocket calculators, the numbers that most professionals needed -- bankers, insurance agents, ship captains, engineers — were to be found in lookup books like this, filled with tables of figures.
U danima prije džepnih kalkulatora, brojevi potrebni većini stručnjaka - bankarima, agentima osiguranja, brodskim kapetanima, inženjerima - mogli su se naći u  preglednim knjigama poput ove, ispunjenima tablicama s brojevima.