Rivers 1633. : A new almanack for the yeare since the nativitie of our Saviour MDCXXXIII. Being the first after the leap-yeare. : Calculated for the famous Vniversitie and towne of Cambridge; and may generally serve for the whole isle of Great Britain. / - Rivers, Peregrine. (Printed by the Printers to the Universitie of Cambridge., 1633)