Rabbi Dr. Joseph Litvin (1896 – 1966) arrived in London before the Second World War from Latvia. He was described as a Zionist of First World War Vintage and was a prolific speaker at Synagogue events during the 1940s, 50s, and up to his death in 1966. In 1941 he was the Representative of the Polish Jews Refugee Fund in London, then worked for the JNF Machleket HaCharedim and then became the long-time Secretary of the Synagogue Council of the British Zionist Federation. He was also the editor of the Zionist Year Book.
His book, printed by the Narodiczky Press, was titled Yismach Yisrael (Al Ahavath Yisrael v’Eretz Yisrael) and described by Rabbi Litvin as a compendium of Rabbinic laws and ideas regarding love for the People of Israel and the Land of Israel.
My copy is signed by Rabbi Litvin.
The book starts with a memorial to Rabbi Litvin’s family, including his father, Rabbi Israel, his mother Batia, and his brother Yaakov and his family, all of whom were murdered by the Germans in Riga, Latvia, during the war.
There is a very interesting haskamah (approbation) from Rabbi Meir Karelitz (1875-1955), the brother of the Chazon Ish. He was the Rabbi of Llachovic (now in Belarus), emigrated to Israel and was a member of the Council of Torah Sages of Agudas Yisroel.
This is followed by the introduction where Rabbi Litvin explains how he obtained this approbation.
Jewish Miscellanies 
What more do you know about
JNF Machleket haredim?