Extract from "Baptisms solemnized in the Parish of Bishops Nympton in the County of Devon in the Year 1864" (available on microfiche at the South Molton (UK) Museum)
The extract indicates (at line 691) that George Alfred Greenslade, the son of George and Jane Greenslade of Bishops Nympton, was baptised on December 4, 1864.

Marriage record for George Alfred Greenslade and Rhoda Mills
Source: "Canada, Ontario Marriages, 1869-1927," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FMJR-JG5 : 8 March 2021), George Alfred Greenslade and Rhoda Mills, 28 Dec 1887; citing registration , London, Middlesex, Ontario, Canada, Archives of Ontario, Toronto; FHL microfilm 1,870,217.

Naturalization certificate

Information of file at the Panama Canal Museum in Panama City, Panama

Certificate of baptism
The relevant information is in the last paragraph.
Hover over image to see enlarged version.
Source: Panamá, registros parroquiales y diocesanos, 1707-1973," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2Z6-TZTH : 10 April 2020), George Alfred Greenslade Greenslade, 11 Sep 1913; Baptism; citing Ciudad de Panamá, Panamá, Panamá, Registros parroquiales católicos (Catholic parish registers), Panama; FHL microfilm 760,705.

Certificate of Death

"George A. Greenslade", The Salisbury Times (Maryland), July 7, 1947
The article reads as follows:
     A Solemn Mass of Requiem will be said for George A Greenslade, at St. Francis de Sales Roman Catholic Church Wednesday at 9:30 with the Rev. Eugene T. Stout officiating.
     Mr. Greenslade, who was 82, died yesterday morning at his home on Hammond Street after a long illness. He was the husband of the late Eva J. Greenslade who died December 20, 1946.
     He came to Salisbury 17 years ago from Banes, Cuba, after retiring as superintendent of railroads with the United Fruit Company. He worked on the Panama Canal as superintendent of construction, later being engaged in railroad construction work in South America.
     Surviving are four sons, Robert, of Salisbury; John, of Atlanta, Ga., James and Richard Greenslade of New York City; four daughters, Mrs. E.S. Towery, Concord, N.C.; Mrs. O.C. Burnett, Atlanta, Ga. and Carolina and Georgiana of Salisbury. A son, William, died in 1924.
     He also leaves two sisters living n England as well as 14 grandchildren and five great grandchildren.
     Interment will be made in Wicomico Memorial Park.

"Greenslade To Be Buried Tomorrow", The Salisbury Times (Maryland), July 8, 1947
The article reads as follows:
     A Solemn Mass of Requiem will be said for George A Greenslade at St. Francis de Sales Roman Catholic Church tomorrow morning at 9:30 and interment will be made in Wicomico Memorial Park.
     Greenslade died as his home on Hammond St. Sunday after a long illness. Friends may call at his late home tonight.