The Internet Assigned Numbers Authority (IANA) assigns two-letter codes for country-coded top-level domains in Internet addresses. (See link to full country code list below.) These codes follow the ISO 2-alpha codes assigned by the International Organization for Standardization (ISO) under its standard ISO 3166 in nearly all cases.
To do a targeted search for websites from a certain country: type in site:, followed by the two-letter IANA country code before your search term
Sample search for websites from the United Kingdom with information on victorian melodrama: site:uk victorian melodrama
Melodrama Unveiled: American theater and culture, 1800-1850 by 
Blood and Thunder: Mid-Victorian Melodrama and its Origins by 
