a comienzos de + Fecha

= in the early + Fecha, in the early part of + Fecha

Ex. Online information retrieval services, which permit users to search data bases held on a computer many miles distant from the user and his terminal, started to develop in the late 1960s and the early 1970s.

Ex. In the early part of the 20th century donations were received from William K. Bixby which led to the foundation of the rare book collection.

* * *

= in the early + Fecha, in the early part of + Fecha

Ex: Online information retrieval services, which permit users to search data bases held on a computer many miles distant from the user and his terminal, started to develop in the late 1960s and the early 1970s.

Ex: In the early part of the 20th century donations were received from William K. Bixby which led to the foundation of the rare book collection.