Before WWI, Croatia was part of Austro-Hungarian Empire
and ruled by Hungary.
Parts of Croatia had been under Italian rule for 100's of years.
Parts of Italy were formerly under both Austrian and Italian control.
Traded hands back and forth. For example, the Istrian peninsula.
At one time Italy ruled the Dalmatia coast of Croatia.
Town of origin is required to research surnames .
I expect that Lucine Piccolo was LUSINPIKOLO or (MALI LOS^INJ)
located 115 miles SW of Zagreb and on Los^inj otok (island)
below the islands of Krk and Cres in the Adriatic Sea.
In 1945, all birth, marriage, and death records held by
churches in Croatia were turned over to the civil authorities
and were deposited with the 'opc'ina' (community city office).
For small villages or places that did not have a city office -
the opc'ina would then be in the next largest village or town.
There are 400 municipalities (opc'ine sg. opc'ina) under the
21 z^upanija (county) in Croatia.
Churches were allowed to keep only baptismal records and the
Stanju Dusa - the so-called "Knjiga Dusa" - "A Book of Souls"
This is a genealogical record of any one generation and
lists the man and woman upon marriage and each child as born ;
commented if emigrated or died.
Any birth and death records older than 1860 were turned over
to the Croatian historical archives.
My understanding is that all religious records had been collected
in State Archives, located at: Varaz^din, Zagreb, Pazin, Rijeka,
Karlovac, Zadar, Split, Dubrovnik, Sisak, Slavonski Brod, and Osijek.
The LDS-Mormons have filmed the parish records at the Croatian State
Archives(and some vital records in Slovenia)
Many placenames are known to have microfilm records at the Family
History Library (FHL) in Salt Lake City, UT.
These microfilm reels are available for rental and viewing
at any Family History Center (FHC).
90% of patrons are non-Mormons doing surname research.
These records generally cover 1800 (and earlier) to 1914.
The records microfilmed have greater linguistic diversity than
for most other geographic regions.
Latin, Croatian, Slovene, Serbian, German, Hungarian, or Italian
are possible languages used.