diff --git a/bibliobase.bib b/bibliobase.bib
index 792b79b..fa29425 100644
--- a/bibliobase.bib
+++ b/bibliobase.bib
@@ -64864,7 +64864,7 @@ author = {Leslie London},
 @Manual{nss70manual,
 	Title = {{Instructions to Field Staff, Volume-I, Design,
                   Concepts, Definitions and Procedures, Socio-Economic
-                  Survey, NSS 70th Round, (January, 2013--December, 2013)}},
+                  Survey, NSS 70th Round, (January, 2013-December, 2013)}},
         author = {{National Sample Survey Organisation}},
         shortauthor = {NSSO},
 	Month = 5,
@@ -64874,6 +64874,19 @@ author = {Leslie London},
 	Year = {2013},
 }
 
+
+@Manual{nsso1991manual,
+	Title = {{Instructions to Field Staff, NSS 48^{th} Round, (January-December, 1992)}},
+        author = {{National Sample Survey Organisation}},
+        shortauthor = {NSSO},
+	Month = 5,
+	Organization = {National Sample Survey Organisation, Ministry of
+                  Statistics and Programme Implementation, Government
+                  of {I}ndia, New Delhi},
+	Year = {1992},
+        url = {http://mail.mospi.gov.in/index.php/catalog/97/download/1169},
+}
+
 @Article{deepak2016,
 	Title = {Discrepancies in Data on Landholdings in Rural India: Aggregate and Distributional Implications},
 	Author = {Deepak Kumar},
@@ -65455,7 +65468,7 @@ doi = {10.1080/00220389608422451},
 	title = {Some Aspects of Operational Holdings},
 	institution = {National Sample Survey Organisation, Department of Statistics, Government of India, New Delhi},
 	year = 1986,
-	type = {Report No. 331, NSSO 37^{th} Round, January-December 1982},
+	type = {Report No. 331, NSSO 37^{th} Round, January-December, 1982},
         url = {http://mospi.nic.in/sites/default/files/publication_reports/nss_report_331.pdf},
 }
 
@@ -65465,7 +65478,7 @@ doi = {10.1080/00220389608422451},
   title =        {Some Aspects of Operational Land Holdings in India, 2002-03},
   institution =    {National Sample Survey  Organisation, Ministry of Statistics & Programme Implementation, Government of India, New Delhi},
   year =         {2006},
-  type =       {Report No. 492(59/18.1/3), NSS 59^{th} Round, January-December 2003},
+  type =       {Report No. 492(59/18.1/3), NSS 59^{th} Round, January-December, 2003},
   url = {http://mospi.nic.in/sites/default/files/publication_reports/492_final.pdf},
 }
 
@@ -65475,7 +65488,7 @@ doi = {10.1080/00220389608422451},
 	title = {Some Aspects of Household Ownership Holdings},
 	institution = {National Sample Survey Organisation, Department of Statistics, Government of India, New Delhi},
 	year = 1987,
-	type = {Report No. 330, NSSO 37^{th} Round, January-December 1982},
+	type = {Report No. 330, NSSO 37^{th} Round, January-December, 1982},
         url = {http://mospi.nic.in/sites/default/files/publication_reports/nss_report_330_0.pdf},
 }
 
@@ -65485,7 +65498,7 @@ doi = {10.1080/00220389608422451},
         shortauthor = {NSSO},
 	institution = {National Sample Survey Organisation, Ministry of Statistics and Programme Implementation, Government of India, New Delhi},
 	Year = 1992,
-	type = {Report No. 407, Land and Livestock Holdings Survey, NSSO 48^{th} Round, January-December 1992},
+	type = {Report No. 407, Land and Livestock Holdings Survey, NSSO 48^{th} Round, January-December, 1992},
         url = {http://mospi.nic.in/sites/default/files/publication_reports/407_final.pdf},
 }