![LAPLACE, Pierre Simon. Autograph letter signed ("Laplace") to Jean-Baptiste Biot (1774-1862), 30 germinal Year VII [19 April 1799]. 1 page, 8vo, integral autograph address leaf, small stain away from text, remnants of tipping on address leaf,](https://stageimg.invaluable.com/housePhotos/christies/06/225606/H0027-L08486059.jpg)
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- Ascension Island
- Andorra
- United Arab Emirates
- Afghanistan
- Antigua and Barbuda
- Anguilla
- Albania
- Armenia
- Angola
- Argentina
- American Samoa
- Austria
- Australia
- Aruba
- Åland Islands
- Azerbaijan
- Bosnia and Herzegovina
- Barbados
- Bangladesh
- Belgium
- Burkina Faso
- Bulgaria
- Bahrain
- Burundi
- Benin
- Saint Barthélemy
- Bermuda
- Brunei Darussalam
- Bolivia
- Bonaire, Sint Eustatius and Saba
- Brazil
- Bahamas
- Bhutan
- Botswana
- Belarus
- Belize
- Canada
- Cocos (Keeling) Islands
- Congo, Democratic Republic of the
- Central African Republic
- Congo
- Switzerland
- Cote d'Ivoire
- Cook Islands
- Chile
- Cameroon
- China
- Colombia
- Costa Rica
- Cuba
- Cape Verde
- Curaçao
- Christmas Island
- Cyprus
- Czech Republic
- Germany
- Djibouti
- Denmark
- Dominica
- Dominican Republic
- Algeria
- Ecuador
- Estonia
- Egypt
- Western Sahara
- Eritrea
- Spain
- Ethiopia
- Finland
- Fiji
- Falkland Islands
- Federated States of Micronesia
- Faroe Islands
- France
- Gabon
- United Kingdom
- Grenada
- Georgia
- French Guiana
- Guernsey
- Ghana
- Gibraltar
- Greenland
- Gambia
- Guinea
- Guadeloupe
- Equatorial Guinea
- Greece
- Guatemala
- Guam
- Guinea-Bissau
- Guyana
- Hong Kong
- Honduras
- Croatia
- Haiti
- Hungary
- Indonesia
- Ireland
- Israel
- Isle of Man
- India
- British Indian Ocean Territory
- Iraq
- Iran
- Iceland
- Italy
- Jersey
- Jamaica
- Jordan
- Japan
- Kenya
- Kyrgyzstan
- Cambodia
- Kiribati
- Comoros
- Saint Kitts and Nevis
- North Korea
- South Korea
- Kuwait
- Cayman Islands
- Kazakhstan
- Laos
- Lebanon
- Saint Lucia
- Liechtenstein
- Sri Lanka
- Liberia
- Lesotho
- Lithuania
- Luxembourg
- Latvia
- Libya
- Morocco
- Monaco
- Moldova
- Montenegro
- Saint Martin (French Part)
- Madagascar
- Marshall Islands
- North Macedonia
- Mali
- Myanmar
- Mongolia
- Macao
- Northern Mariana Islands
- Martinique
- Mauritania
- Montserrat
- Malta
- Mauritius
- Maldives
- Malawi
- Mexico
- Malaysia
- Mozambique
- Namibia
- New Caledonia
- Niger
- Norfolk Island
- Nigeria
- Nicaragua
- Netherlands
- Norway
- Nepal
- Nauru
- Niue
- New Zealand
- Oman
- Panama
- Peru
- French Polynesia
- Papua New Guinea
- Philippines
- Pakistan
- Poland
- Saint Pierre and Miquelon
- Puerto Rico
- Palestine
- Portugal
- Palau
- Paraguay
- Qatar
- Reunion
- Romania
- Serbia
- Russia
- Rwanda
- Saudi Arabia
- Solomon Islands
- Seychelles
- Sudan
- Sweden
- Singapore
- Saint Helena
- Slovenia
- Svalbard and Jan Mayen
- Slovakia
- Sierra Leone
- San Marino
- Senegal
- Somalia
- Suriname
- South Sudan
- Sao Tome and Principe
- El Salvador
- Sint Maarten
- Syria
- Swaziland
- Tristan da Cunha
- Turks and Caicos Islands
- Chad
- Togo
- Thailand
- Tajikistan
- Tokelau
- Timor-Leste
- Turkmenistan
- Tunisia
- Tonga
- Turkey
- Trinidad and Tobago
- Tuvalu
- Taiwan
- Tanzania
- Ukraine
- Uganda
- United States
- Uruguay
- Uzbekistan
- Holy See (Vatican City State)
- Saint Vincent and the Grenadines
- Venezuela
- Virgin Islands, British
- Virgin Islands, U.S.
- Vietnam
- Vanuatu
- Wallis and Futuna
- Samoa
- Kosovo
- Yemen
- Mayotte
- South Africa
- Zambia
- Zimbabwe
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